Place all ingredients in a VERY large bowl, and stir gently until combined. Store in an airtight container in a cool, dry location.
Preheat oven to 400F degrees. Spray two muffin tins with non-stick spray, or prepare with paper liners.
In large bowl, beat 4 eggs. Add 3 teaspoons vanilla, 2 cups water and ¾ cup vegetable or canola oil.
Stir in 5 ½ cups of dry muffin mix, just until moistened. Gently add in any mix-ins (see notes or find the full list at grouprecipes.com).
Spoon into prepared muffin tins, making sure to fill each muffin cup to the top. Optional: Add topping(s).
Bake at 400F for 18-20 minutes until tops are golden brown and toothpick inserted into muffin comes out clean.
